Method of making stone-planer tools



May 13, 1930. w F BROMM 1,758,780

METHOD OF MAKING STONE PLANER TOOLS Filed Oct. 11, 1926 WAX/4am fimmm,

Patented May 13, 1930 WILLIAM F. BROMIVI, OF CHICAGO, ILLINOIS METHOD OF MAKING- STOll'E-PLANER TOOLS Application filed October 11, 1928. Serial No. 140,717.

This invention relates to a planer tool havin a side out and particularly designed for trimming, cutting or dressing stone by means of a planer.

The principal object of the invention is to provide a tool of this kind which has a shank of sn'liicient size to support the tool with a somewhat wider cutting plate, provided with a cutting edge made not of the ordinary low carbon steel, but with a backing and shank of low carbon steel and a cutting edge of socalled high speed steel welded thereto under high pressure and under the action of a sohlering flux.

in the accompanying drawin Figure 1 illustrates a strip or bar of ordinary steel of which the shank of the tool is made;

Fi ure 2 illustrates the bar of Figure 1 fuilcred out or widened at one end;

Figure 3 illustrates the method of trimining or cutting the outer edge of the battered portion of the tool;

Figure 4 shows the tool with the outer edge cut oil;

Figure 5 illustrates the application of a piece of high speed steel, substantially conforming in shape to the battered portion 01 shank;

igure 6 is a diagrammatic representation he application of pressure to press the 1 speed strip in a close welding contact 1 the ordinary steel shank; and

'gure 7 illustrates the formed tool in its final shape.

-ferrirg now more particularly to the "s, a strip or bar 1 of ordinary low teel is heated at one end to a forging at-ure below the welding point, and l s end 2 fullered or forged by hand or mahine until it is flattened out evenly beyond the sides of the shank and at a decreased kness. This fullered end 2 is somewhat gular in shape due to the flattening action, while it is still hot, the outer edge is nned with a straight knife 3 to form the .1, ight edge 4 as seen in Figure 4.

This makes a broadened flat extremity thinner than the original bar 1 and to this flattened portion is applied a piece or strip high sneed steel, which is capable of cutmetal and stone at high speed without reterioration of the cutting edge. ie method of application of the high speed strip 5 is to heat the flattened portion 2 and the strip 5 to a welding temperature, preferably in agas furnace which can be "ccurately controlled and thento place these parts together in the position shown in Figure 5, in a hydraulic press 7, as represented in Figure 6, a welding flux 8 being first interposed between the flattened portion 2 and the high speed strip 5 so that upon the application of pressure, a smooth firm joint ans union will be made between the adjacent surfaces of the flattened portion 2 and the strip In practice the joint obtained by the apulication of pressure is so close and firmly uni-ed that when the edges are ground to the proper shape, it is difiicult if not impossible to find the l ne of union of the two parts.

After the high speed strip is welded in place the shank 1 is formed with a bend 9 adjacent the cutting end and the extremity is ground to present a cutting edge or point 10,

indicated in Figure 7 Tools of this kind are particularly adapted r use in trimming or dressing stone and used in planers for this purpose to take the place of a great many smaller cutters for doing the same work. As a matter of fact, this tool does better work because it makes a more even cut, it is practically impossible to distor t or destroy any portion of the cutting ed e without damaging the whole tool; whereas in the case of several small tools for accomplishing the same result, the breaking or bending of one tool might destroy or damanother piece.

It is obvious that in addition to cutting stone a tool, of this kind is capable of many us s wherever applicable.

I claim:

1. The method of making a high speed tool with a low carbon holder which consists in o broadening and flattening one end of a bar of low carbon steel, in welding thereto under pressure a thin piece of high speed steel which extends the full width of the flattened portion, and in bending and grinding the edge so that the high speed steel is hacked and supported by the low carbon material for the full length of the cutting edge.

2. The method of making a high speed tool With a low carbon holder Which consists in forging one end of a low carbon bar to flatten and Widen the extremity thereof, in cutting off the extremity of the flattened end, in applying to the end a similarly shaped thin piece of high speed steel, and in Welding the strip and the flattened portion together under the application of pressure.

3. The method of making a high-speed tool with a loW carbon holder Which consists in forging one end of a low carbon bar to flatten and Widen the extremity thereof, in cutting 03? the extremity of the flattened end, in applying to the end a similarly shaped thin piece of highspeed steel, and in attaching the strip and flattened portion together.

WILLIAM F. BROMM. 

